Question

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Answer 1

Answer:

1) Neon valency is zero

2) The valency of nitrogen atom in N2 molecule is three. Since, it is participate in the formation three bonds. But the valency of nitrogen molecule as whole is zero

3) The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions

4) Carbonic acid

5) (→) formula written above the arrow is used as a catalyst in the reaction